I took two villagers to practice driving for a day, and during this time, I watched them drive the dump truck back to the base and deliver the meals cooked for everyone to the construction site in Taniguchi. Every villager drove a "long distance" back and forth, and judging from the operation on the way, avoiding potholes, shifting gears and parking, at most two more days of practice could let them go out to drive together.

Wei Minsheng ran for two more days with two more villagers, and by the way, he laid the wires to the mouth of the valley, and when he saw that the oil in the tank was almost empty, he went back to his own world, bought a large iron drum like gasoline and diesel and brought it back to the other world, and after filling the car with gas, let them practice by themselves. I filled the excavator with fuel and drove directly to the construction site at the mouth of the valley to help, and filled the larger depression on the road to facilitate the driving of the dump truck.

Because the speed of the excavator was already slow, and the road had to be repaired all the way, Wei Minsheng took a full morning to drive the excavator to the place where the villagers were digging the foundation.

After three days of work, the place designated by Wei Minsheng was five meters wide and twenty meters long, except for the location of the gate reserved in the middle, the floating soil on the surface had been dug out more than two meters deep, but the rock layer below was still not visible.

Wei Minsheng simply filled the steep place of the "gourd waist" with excavated soil, and after slightly compacting it with a crawler, he built a four-meter-wide road to facilitate the free entry and exit of dump trucks.

Since the two villagers drove the dump truck back to the base to pick up the lunch meal, Wei Minsheng looked at the construction site and thought about what kind of city wall he should build.

If you have something ahead of the times like cement in your hands, and then build the city wall like other city walls, it is obviously a waste of resources. Due to the plasticity of concrete, it is completely possible to build a covered city wall like repairing a building, and the personnel responsible for patrolling can patrol in layers in the future, leaving some small windows on the wall, and lighting fireworks bombs are one by one fire points. The range of fireworks, which is generally between 30 and 50 meters, can basically cover the valley of about 20 meters in front of the fortifications. There are no tall trees growing in this valley, and it is likely that this is the valley where the floodway of this mountain is located, and if the pond is dug deeper and larger, and the flood water is stored, it is connected to the city wall with a large cement pipe, and a sluice gate is set up. The entrance and exit of the city wall are built in the shape of a waterway, and by taking advantage of the drop of the pond water, as long as the sluice gate is opened, it is a natural defensive water section, which is enough to wash away the things in the valley outside the city wall.

The entrance and exit in the middle of the city wall can be made wider, because there is no large-scale construction equipment here, the span can not be made very large, but a prismatic pier can be built to support the buildings above, the two acute angles of the prism can effectively reduce the impulse of the water flow, and also reduce the stress surface, even if the outside with a large catapult can not effectively strike at the pier, to ensure the safety of the fortifications. The passage of 5 meters on both sides of the bridge pier is left to facilitate the entry and exit of vehicles, and the passage is closed with the gate made of steel plate, and the upper part of the gate is controlled by the pulley block to control the lifting of the gate. The passage is usually used to transport materials in and out, if the enemy invades, as long as the front of the dump truck is added with two steel plates, made into the form of arrows, rushed out of the channel, it is an excellent tool to break the formation, it is almost impossible to resist manpower, if you weld some steel bars on the steel plate like a hedgehog, is it too cruel. There are also excavators, which, after protecting the cab with steel plates, can also crush all the armies armed with cold weapons. Molotov cocktails can also be used to turn the valley in front of the fortifications into a dead place. Coupled with the fireworks, fireworks, and pebbles on the fortifications, there is no way to take this line of defense without cross-era weapons.

If these ideas are completed, your base will be completely safe. Only on the premise of ensuring the security of the base can it be possible to develop its own forces wholeheartedly.

According to Wei Minsheng's idea, the width of the middle two passages and bridge piers is 12 meters, and the total width of this valley is only more than 20 meters, and only more than 4 meters of concrete walls need to be built on both sides. Now the excavator has been in place, the foundation can be easily completed, the cement is more convenient, that is, the river sand and pebbles have to go to the river to get it, take advantage of the shallow water in the river in winter, first get it to the river bank to pile up, wait for the next road to go down, and transport it back with a dump truck.

Thinking of pouring concrete, steel molds, frame pipes, mixers and concrete vibrating rods and other materials are used, but the power of the mixer is too large, and the power of its own power supply system is not enough, so it can only be replaced by manual labor, and the power of the concrete vibrating rod is about one kilowatt, and it is still possible to use only one. So I went back and gave Liu Mengling a list of relevant materials to rent or buy.

When they returned to the other world, lunch had already been delivered, and after everyone had eaten and rested for a while, Wei Minsheng arranged for the villagers to go to the river to fetch river sand and pebbles. I operated the excavator to take out the soft soil, loaded it on the dump truck, and taught two villagers how to unload the soil on the car after it was full, and told them some precautions when raising the hydraulic arm. Due to the spacious place and the fact that they do not learn theoretical knowledge and traffic rules, after two days of practice, the two villagers are already basically familiar with moving forward and reversing, and the operation of unloading the soil is also very simple, but there are some precautions, so they quickly mastered this operation.

With the addition of dump trucks and excavators, the foundation on both sides quickly dug into the rock, in order to make the foundation more solid, Wei Minsheng asked the villagers to use an electric pick to open a few deep grooves on the rock, so that the concrete foundation can be integrated with the rock, not easy to displace.

For the rest of the day, Wei Minsheng and his villagers dug up river sand and pebbles, during which time they went back to buy some oil. Since the purchase of bulk gasoline is now strictly managed by the state, Wei Minsheng felt that it was time for Liu Mengling and her sisters to buy a private gas station, and it would be more convenient for them to use their own oil.

A few days later, Wei Minsheng returned to the warehouse and brought the steel bars, cutting machines and gold pulling tools to the open space in the valley, and instructed the villagers to learn by doing according to the steel bar construction specifications and some design drawings downloaded from the Internet, as well as the use of steel bars and some construction videos he had seen on the construction site before, and then lay a net made of steel bars in the dug foundation, and then pour it with concrete. In fact, the bending of the steel bar is also a repetitive work, basically you can understand it at a glance, Wei Minsheng only needs to pave the steel bar, and let the villagers tie the wire to wrap the intersection of the steel bar firmly.

Since he has not systematically learned the relevant knowledge, Wei Minsheng operates by feeling, the proportion of cement and river sand is mixed according to high standards, and the distribution density of steel bars is also increased. In order to make the pouring body and the valley wall more closely combined, the villagers were asked to use an electric pickaxe to open a two-meter-deep hole in the valley wall every two meters high, and the steel bars were laid inside and concrete was poured, which was firmly connected to the pouring body outside. In order to save cement, a large cobblestone is filled in the large gap in the middle of the pouring body, and the air in the pouring body is discharged with a vibrating rod. After the pebble and cement slurry are tightly combined, the strength of the pouring body is further enhanced by the hardness of the pebbles.